Surface Pro - fantastic hardware, little small, good keyboard, but mostly needs a hard surface to use it on.

Sony Vaio Duo 11 - all the right specs, but I heard the battery life may be the worst of the bunch and I'm unsure about that fixed slider screen/keyboard

Lenovo Yoga 13 - clearly a different sort of device, but solid specs except no digitizer for pen use and I'm undecided on the exposed keyboard in tablet mode.

I was almost set on the Surface Pro with the Type cover keyboard, but then did some more research and found I can get the Lenovo Yoga 13 for $740 from their outlet store. That's a fantastic price compared to the $1130+ for the Surface Pro with keyboard. The trade-offs are no pen, no detachable keyboard for pure tablet mode (read: heavier all the time).

Wow that was longer than I expected - if you made it this far thanks for reading! What do you think? I'm very tempted by that refurb Yoga 13 deal. Any reason *not* to do that? Anything I haven't thought of?